Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
Publication date: 20th April 2022
Over the last few decades, perovskite solar cells (PSCs) have been widely studied due to their excellent optoelectronic properties [1], reaching a certified power conversion efficiency (PCE) of 25.5% in 2021. Nevertheless, one of the main challenges for their commercialization is to solve their instability issues [2], mainly originated from the degradation of the perovskite active layer as well as the degradation of the interfaces and electrodes. A thorough understanding of the processes taking place in the device is key for the development of this technology. On the other hand, the active layer thickness is one of the most important parameters to optimize the device layer structure. Indeed, there is a trade-off between light absorption, which increases with perovskite thickness, and charge extraction, which can be limited in thicker active layers, due to inefficient carrier transport or reduced charge mobility.
Herein, Cs0.15FA0.85PbI2.85Br0.15 PSCs with different active layer thicknesses (350, 500 and 650 nm) have been characterized. In order to study device degradation, indoor cell lifetime testing was carried out according to the International Summit on OSC Stability (ISOS) standard L-1 protocol [3]. Devices show a dramatic burn-in degradation that increases with active layer thickness. After several minutes of continuous illumination, the efficiency of thinner and medium thickness devices stabilizes. However, thicker samples show no stabilization of the efficiency. In order to study in detail the dynamical processes occurring in the device, samples were also characterized using Impedance Spectroscopy (IS) at different degradation stages, and data were fitted to a three RC/RCPE circuit [4]. The low frequency capacitance in the thickest samples suffers a strong increase with time, which suggests a significant growth of the mobile ion population. This increase of the ion density partially screens the electric field, which yields a reduction of the extracted current and, consequently, the efficiency.
This work has been supported by Comunidad de Madrid under the SINFOTON2-CM Research Program (S2018/NMT-4326-SINFOTON2-CM) and the Spanish Ministry of Economy, the Agencia Estatal de Investigación and European Union’s FEDER under the TEC2016-77242-C3-3RnAEI/FEDER, UE Projects.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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